Abstract
In order to reveal the future conductor structure for a high Tc superconductor, a stability evaluation was conducted. Flux jumping, minimum propagating zone (MPZ) and full stabilization with copper were discussed, based on parameters obtained for YBaCuO (YBCO) at 77K. Obtained results were as follows. Flux jumping can not take place in a YBCO core whose diameter is less than 0.8mm. Therefore, the conductor structure does not have to be like a multifilamentary composite. The MPZ for YBCO at 77K is nearly equals to that for NbTi at 4.2K. However, specific heat of YBCO is 200 times larger than that for NbTi. Therefore, the YBCO stability against thermal disturbance is almost 200 times larger than NbTi. Current density in a fully stabilized conductor with a copper stabilizer at 77K is as low as that for a normal copper conductor.
